IMPORTANT:
The SSD Announcement email list is now available.
Major changes are coming in the near future,
including possible hostname and/or URL changes.
To be notified of such changes, subscribe to this email list.

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.